Hello everyone I get sponsored by my wife I got my PR in 2015 now things are not good between us we decided to divorce this year 2020
My son is 3 years old and my daughter is 2 months old
You do see the math issue here? That "now" things are not good between you and your spouse but your child from your girlfriend is three years old? So there was another relationship for about four years (minimum)?
The formal requirement is that if you "were sponsored by a spouse or partner and you became a permanent resident less than 5 years ago", you are not eligible. So you must wait at least five years; I believe that is calculated from date of landing.
You may face some extra scrutiny of your application - at minimum. Possibly more serious.
You likely cannot apply as common law, so would need to get married. That means completing divorce procedures at minimum.
You may wish to consult a lawyer. From a skeptical viewpoint, it may look as if your original application/PR status was a marriage of convenience (to get status). I am not a lawyer so do not know about legal consequences, but you should not apply to sponsor unless/until you have clarified.