Master's and a doctorate degree is usually necessary to work in this field. It will be easier for you to get the degrees and work in this field because you already have a psychology background.

Here's a list of some institutes that offer the above mentioned courses

1. Lok Nayak Jayaprakash Narayan National Institute of Criminology and forensic Sciences.

2. Institute of Forensic Science, Mumbai

3. IFS Education Department, Pune

4. OU - Osmania University, Hyderabad

5. Dr. Harisingh Gour Vishwavidyalaya, Sagar

6. BU - Bundelkhand University, Jhansi

7. Gujarat Forensic Sciences University, Gandhinagar

Once you get into the course you will learn more about it. It is a growing field and has much scope now. After completing the degrees you will have to go through the process of Licensure. Each state has specific requirements to become a forensic psychologist, all states require certification or licensure to practice.You will discover clearly about all this once enrolled in the course.  All the best. :)