Not if you're actually going to ski, because they're not as strong as ski goggles, so if you fall they're just going to break into little pieces and you could damage your eyes with the splinters.
Can sunglasses be used as ski goggles?
I wore sunglasses for many years while skiing. A ski mask would be more effective in cold snowy conditions. If you can get a mask it would be preferable. I would just get my butt up there and have fun. Worry about more proper gear as you improve and have the budget for comfort.
Well you can use them as ski goggles i do but janey is right you could get hurt of course i never even thought that the sunglasses could get you hurt ether way its your choice!