Thank you for your reply. His first wife will not go to Canada. They will stay in Pakistan with his kids because of culture. I will marry him as second wife because we cannot live together now if we are not married. Im going to Canada for my First arrival on April. So if i will sponsor him and We will not put in our application that he have a first wife because we will live in Canada as a konogamous relationship. His wife is not going there. It will be possible? Or he will apply for express entry to Canada without mentioning his 1st wife in his application instead he will put me as a wife? It will be possible or not?
You are digging yourself into a deeper and deeper hole here. Your circumstances are too complex to be resolved by lay-persons via a forum. You need to speak to a competent CANADIAN immigration LAWYER, NOW, before you do anything else. If you are not yet landed as a Permanent Resident in Canada, you *may*, with good legal advice, be able to rescue your situation. If you land now, without sorting out the marital/common-law mess, I believe that you will find that you are going to be committing misrepresentation and/or going to be barred from sponsorship of your "partner".
For reference :
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/permanent-residence/non-economic-classes/family-class-determining-spouse/legality.html
Polygamy
Polygamous marriages are not legal in Canada and are an offence under the Criminal Code of Canada.
A spouse is not a member of the family class if the spouse or sponsor was already married to another person at the time of the subsequent marriage [R117(9)(c)(i)]. This regulation prohibits a second (or third, etc.) wife from being recognized as a spouse within the family class and provides that only the first marriage may be recognized for immigration purposes.
For the first marriage to be recognized as legally valid under Canadian law, the couple must live together in a monogamous marriage in Canada. Common law imparts that a polygamous marriage can be
converted into a monogamous marriage provided that the couple live together in a monogamous relationship from the time of arrival in Canada. This conversion can be done if the couple states their intention to convert their marriage to a monogamous one, followed by some factual evidence that they have complied – usually by divorcing the other spouses and/or by a remarriage in a form that is valid in Canada.
Note: The Department cannot
require divorce(s) and remarriage. However, officers can ask for evidence that the parties have converted their marriage to a monogamous one and can explain what might constitute such evidence.
The decision to refuse an application must be based on the balance of all evidence, and not solely on the fact that the applicant did not obtain a divorce. The parties must understand that refusal to provide such evidence may result in the refusal of their application.
A polygamous second (or third, etc.) marriage cannot be converted to one of monogamy. If a husband wishes to sponsor a wife other than his first as his spouse, he must divorce his other wives and remarry the chosen wife in a form of marriage that is recognized as valid in Canada.
When a sponsor and applicant have been practising polygamy and there are
children from several spouses, caution the sponsor and the spouse being sponsored that other spouses will not be eligible for immigration to Canada even if their respective children are sponsored. Officers must explain that separation of children from their mothers will likely be permanent, and counsel the sponsor and applicant to consider the consequences of that separation on the children. If the children nonetheless are sponsored, and if one of these children subsequently sponsors their respective mother, explain to the mother that she will have no spousal status and related legal protection in Canada and that she will not be eligible for support or other benefits that also flow from marriage under Canadian law.
The prohibition against polygamy in the Regulations, and the lack of recognition of all spouses except the first, cannot be avoided by
processing a second spouse as a common-law partner. Legally, it is not possible to establish a common-law relationship that meets the definition of such in terms of conjugality, where one or both parties are still living in a pre-existing conjugal relationship. The notion of conjugality has within it the requirement of monogamy; therefore, it is only possible in law to establish a new common-law relationship after a person is either divorced or separated from the spouse or common-law partner and where they have convincingly formed the intention not to continue with that previous relationship.
An already existing marriage, uninterrupted by separation, divorce or death, is a barrier that cannot be overcome when assessing a second spouse as a common-law partner. However, where such a barrier is removed (i.e. a first wife is subsequently divorced or is deceased), a husband and second wife could choose either to remarry, or could potentially meet the definition of common-law partner (i.e. where a husband was separated from a first wife and lived with a second wife in a bona fide conjugal relationship for one year after the separation from a first wife). Because a subsequent marriage (where the first is continuing) is not valid in Canadian law, persons in such a scenario would be considered as single in law and they would have to remarry to be considered married under Canadian law.