If your primary language is not English and you graduated from a non-Canadian university where the language of instruction and examination was not in English, then you must demonstrate your proficiency in English by successfully completing an acceptable English language proficiency test.
This requirement should be met at the time you submit your application, and must be met before registration is allowed. The TOEFL and IELTS are two of the tests accepted.
The English language test might not be required if you studied in one of the countries listed in the link above or you get your university to provide an official letter confirming English was the primary language of instruction.
For more information:
Including minimum required scores, please see the English-language proficiency testing page.