If you are an international student studying full-time with a valid study permit, your spouse or common-law partner can apply for an open work permit. Having an open work permit enables your spouse or partner to work on or off campus full-time while you study.
In some cases, Canadian visa offices abroad will process spouse/partner work permit applications at the same time as study permit applications. In this case, you will need to include the additional fee for the work permit and complete the work permit application for your spouse/partner, available from the website of the consulate.
Most spouse/partners come to Canada as visitors first and apply for a work permit after they are in Canada. If your spouse or partner does not require a TRV, they may be able to apply for a work permit at the border or airport where they enter Canada.