As I am not from Canada, take what I say with a grain of salt and seek advice from the schools of physiotherapy who run the programmes
Here is a list of programmes.
Canadian Physiotherapy Association - Physiotherapy, It'll Move You
Physiotherapy is now a Masters degree in Canada. You need to complete a bachelors degree first.
Seeing you didn't get very good marks this can work to your advantage. What you need to d is undertake a bachelors degree in a relevant subject (eg exercise science, or kinesiology). As physiotherapy is very competitive you will need to get good marks in your undergraduate degree, probably the better you marks the greater your chances.
Many post graduate entry level programmes have "preferred pathways" - degree subjects and degree programmes they ideally want you to do. so this is something to discuss with the programmes you hope to apply for. This should be the main determinant of subjects in your undergraduate degree.
The Masters programmes can usually be completed in just over 2 years. However at this level programmes are compressed and very hard work- what might have taken an undergraduate to complete in almost twice the amount of time. The advantage of this is that it reduces the training time and you are out there in the real world earning money earlier. But you are very much selected based on demonstrated learning abilities in your undergraduate ed.
With the marks it is important that you "know thyself". Did you get poor marks because you weren't motivated, or situational factors or did really struggle with the subjects? This is important to consider as there is no point in pursuing a degree only not to do well. Otherwise you could end up investing years and money into something that you can't achieve. You have to do well in the sciences - physics, chemistry, biology and maths. There are of course many other important attributes such as communication skills, ability to identify patterns and ability to develop professionalism. But the science content in your undergrad degree is really the first hurdle.
I could be wrong about Canada now but I recall most schools go off previous marks, and interview and sometimes some sort of aptitude test.