Diploma in Clinical Psychology is a very rare course. You can always do your UG and PG in Clinical Psychology but having a scope in Diploma course is very rare.

Now there are two kind of diplomas offered one is Professional Diploma (which one can do after UG or PG in Psychology and its different branches) and another is Diploma which one can do as a fresher as well.

Some of the institutes offering the course in Diploma/ Professional Diploma in Clinical Psychology:

Bhonsala Military College, Nashik

Amity University, Lucknow Campus

Sweekaar Academy of Rehabilitation Sciences, Secunderabad

For more diploma college in Psychology visit the link below:

https://university.careers360.com/colleges/list-of-diploma-in-psychology-degree-colleges-in-india

To know more about Clinical Psychology as a career visit the link below:

https://www.careers360.com/courses/clinical-psychology-course

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