No, you can not get married now and then land on the visa you got when you were single.
This would be considered misrepresentation by immigration and would cause you to never be able to sponsor your spouse for PR and could also cause you to lose your own PR.
You must land first. Then come back, get married. Then go back to Canada (because as a PR, you must reside in Canada in order to sponsor people) and file for sponsorship.
That is exactly what I was thinking of and worried about, hence I asked this question. Thank you so much for enlighting me Sir.
Thank you Dr. Hasib too.