New rules that take effect on June 1, 2014, make it easier for study permit holders to work off campus. Full-time students pursuing an academic, professional or vocational training program at a designated learning institution will be:
eligible to work off campus without a work permit;
allowed to work off campus for up to 20 hours per week during a regular academic session and full time during regularly scheduled breaks; and
able to work off campus immediately rather than waiting six months.
To be able to work in Canada, however, you must be registered and enrolled at your designated learning institution, and you must get a Social Insurance Number from Service Canada.
list of designated learning institution : http://www.cic.gc.ca/english/study/study-institutions-list.asp