Can a commerce student become a physiotherapist?

No, you can't be a physiotherapist as for physiotherapy u need to be of Science background. Refer this article for more information- https://www.shiksha.com/medicine-health-sciences/physiotherapy/articles/a-career-in-physiotherapy-blogId-19609.

Hi Ishita, For Bachelor of Physiotherapy, the eligibility is as follows: To pursue BPT one needs to be pass in 12th class or equivalent with a minimum aggregate of 50% marks in physics, chemistry and biology (including practical) provided the candidate has passed in each subject separately. There