Your best option is to actually move to Canada during the sponsorship process and update your file. If not you need to be prepared to prove you have both taken steps to leave your life abroad like giving notice to your job, home sale or notice to your landlord, proof of securing or trying to secure housing and employment in Canada, etc. You can update your file during processing with this type of evidence. Many were not actually relocating permanently to Canada once their spouse got PR so IRCC now typically wants more concrete proof you will be returning to Canada.
While I think it's important to show your /intent/ to move to Canada, it's frankly ridiculous to imply that people should give notice to their job in circumstances where they do not know how long the sponsorship process might take.
Yes - it can be one component in some circumstances.
@julian147: at this stage, you clearly haven't done much to 'prepare' to move, and reading between the lines, only starting on the sponsorship process.
Some really basic:
-at this point, provide whatever you can to show your intent to move - which might be just research and planning, where to live, job searches in Canada, preps for schooling or working (getting credentials validated), correspondence with a real estate agent, to some degree support from family, etc.
Since it sounds like you're starting to prepare your sponsorship app, you have time to get some of these things while you do so. Submit whatever you have.
-Very Important: IRCC will NOT refuse a sponsorship app for lack of intent to move (I guess they could return the app as incomplete if nothing included, but that's a separate process).
What they OFTEN do is write asking for more information on your plans/intent to move. At this point, it's very important to be able to respond with more detail - i.e. to demonstrate that you have continued to prepare and plan to move. At that point, ideal would be for one of you to have actually moved, but be prepared to provide more - a visit to Canada to house-hunt, progress in housing and job search, preps for specific things like getting pet vaccinations or whatever. FInancial plans - in brief - will be relevant. Inquiries with movers, for example.
In other words, it's important for the plans at that point to be much more concrete and credible. Yes, at this point, some sponsors/applicants may have given notice and quit their jobs or the like.
Moving during the process: as a Canadian, you can obviously return to Canada at any point - you notify IRCC as soon as you have an address to reside in Canada, even temporarily. (Ideally not a bnb or hotel, but something for several months, eg with family fine). If your spouse has a visa or visa-free entry, they can enter as a visitor (important not to say it's a 'move', however) and remain during the process - and even apply for a work permit. (Note the work permit can take months, though).
