Hello,


You can just directly enter Indian army.
You will have to first join the indian army services as an officer and then you will have to volunteer for GTO course and only after that you can move on be a psychologist in a selection board but that too depends whether you have required qualifications or not.
To get into the army you will have to finish a degree in psychology and then attempt the CDS exams and you must ensure that you are not more that 25 years.

I hope this helps.