Samantha Said:

International graduate student in Ontario, Canada?

We Answered:

Based on the information from CIC you can continue using your study permit as long as it is valid:

Here is an except of part of that information:

"However, if you are enrolled in a post-secondary program (doing studies after the high school level), you may change your school, level, program and field of studies without applying for a new study permit. You don’t need to apply for a change to the condition of your study permit either. You may continue to use your study permit as long as it is valid."