In most cases, in order to work in Canada foreign nationals must first obtain work permit.
This authorization may be “open” or “closed” depending on the type of permit. In addition, some foreign nationals must apply for an entry visa prior to coming to Canada. Please see Visit Canada for more information about entry visas.
In order to obtain work permit in Canada, you must usually have pre-arranged employment from an employer authorized to hire you. If you are accompanying a spouse or common-law partner to Canada you may be eligible for a spousal work permit.