If money is out of country they really have no way to determine how much you oweas long as the court is satisfied that you owe the money and have means to pay an order to pay can be made.
If you don't pay you can go to jail. Imprisonment of a payor does not discharge arrears under an order.
Put simply, if you want to thumb your nose at Canadian family court, not only your money but your body should be abroad and not come back.
But yes disobeying the payment order is pretty stupid unless you plan to leave country after you divorce