Use 000 000 000 as a SIN# for now but I will encourage you to contact the CRA at 1-866-223-4403 to inquire about getting an ITN (Individual Tax Number) or TTN (Temporary Tax Number) for your non-resident spouse.
The link below will provide you with the application form.
mar1946-
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hcf12531-gmail-c
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namor
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gsmith98
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copperjuly2015
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