You may apply for a work permit after coming to Canada if:
You, or your parents, have a study permit or work permit.
You are authorized to do one job in Canada without a work permit but want a permit to do another job. To qualify for this, you must: have worked in Canada for three months in a row. not be a business visitor.
You have a Temporary Resident Permit (TRP) that is valid for six or more months.
You are in Canada because you have an inland application for permanent residence. However, you will have to pass certain stages in the principal application before you are eligible to receive a work permit