If you need a SOP (also known as Letter of Explanation) you should write one yourself. You should write about these topics at least:
- Why do you want to study in Canada out of all places
- Why did you choose the course you want the study permit for
- How is the course relevant to your previous education
- How will the course help you find work in your home country*
- How will you fund your studies in Canada
* I'm not sure if it's necessary to say that you want to return to your home country after your studies in Canada. Dual intent IS allowed after all... But I believe that if you are able to argue why you'd have more opportunities in your home country after your studies in Canada, they are more likely to let you in (since then you wouldn't overstay after your student visa is over, you could just go back home and get a good job). Someone else should confirm if this is true.