yes you can, as long as you have not landed yet. In that case however you will have to return your COPR and your application will be reopened and rechecked.
Also get ready very good explanation, why your wife is suddenly accompanying you.
There is also a chance that they might identify it as a hidden intent all along and in that case they would recalculate your CRS points as if at the point of ITA and AOR your wife was accompanying you. The only moment when they are not allowed to do it is if you got married only after your AOR.
So recheck your score with her accompnaying you and if your CRS would be still above draw level at the time of your ITA.
If you have already landed, there is no way to change it and you will have to sponsor your wife and family later on.