Likely you'll need to look towards another option than what Tesla offers or a co-signer who can get approved on their own.
With a new SIN, limited to no Canadian credit, employment, or residence you will be deemed to have no creditworthiness. As someone who is new to Canada you haven't been able to demonstrate the following; Positive past Canadian credit, a proven + consistent income to support repayment, a large down payment, or similar assets, showing you have repaid a Canadian debt under the same term and payment amount.
You need to start with a credit card and build, it will be next to impossible to get 50k+ auto loan without the 5 C's ( Credit, capacity, capital, collateral, conditions, and character)
Good luck in your search.