As per the information available online, in order to be a Community Health officer one need to have a Diploma in Community Health with no less than 2 years of experience or having a BSc Nursing depending on the recruitment category. So with Diploma in Physiotherapy you can't become a Community Health Officer.

To know more about the career in Physiotherapy visit the link below:

https://www.careers360.com/courses/physiotherapy-course

I hope this answer helps. All the very best for your future endeavors!