I'm not sure what you mean by "paid by SIN". If you are asking if it has to be reported to revenue Canada and attached to your SIN when it's paid - then yes. If it isn't - then you're working illegally because your wage isn't being reported.
ok then, i will inform the employer at subway if he is willing to give me min wage and report the salary to cra (even in training). if not. screw it, not risking anything.