Do you have a work permit? If you do then you should go to Service Canada to get your SIN, you'll get it the same day if everything was complete
If not then you gotta file for a temporary tax number with your tax return as you can't send your tax return with no number at all (you mail those)
You can only use the 000 000 000 if your spouse or common law partner is filling his or her tax return and need fill your SIN when you don't have one
Thanks @Geno.uss and @Biny_1982 ! Appreciate your help!!
