If you want spinal manipulation, you can do that as a physio in many countries, it's usually called manual therapy. In Canada, usually, it's set up as extra training post-graduate. There is a mentorship aspect to it, that you find employment with someone who has the qualifications to mentor you through your five manual therapy levels.

Courses and criteria differ in each country and within Canada for each province, so it's difficult to give specifics. You'd have to narrow down where you want to be.