To file your Canadian non-resident tax return, you need your Social Insurance Number, but if you don’t have one, you need to apply for an Individual Tax Number using Form T1261 (Application for a CRA ITN for Non-Residents).
If you’re a non-resident or a deemed non-resident of Canada, you will not be able to NETFILE your tax return. You will have to print and mail or fax it to the CRA. (Fax is a temporary measure due to the long international mail delays).
For full information view link below:
https://turbotax.intuit.ca/tips/the-ultimate-tax-guide-for-non-residents-14388
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