India has entered into prisoner transfer treaties with many nations that allow a person convicted of a crime to be transferred to his or her home country to serve the prison sentence. A prisoner who wants to be transferred should notify the Indian embassy
or consulate of his or her desire. The application then must be approved by the foreign country and the Government of India. For the prisoner to serve the rest of his/her sentence in India, there must not be a standing appeal against his committal to prison
in the foreign country.
For more details, please see the link:http://mea.gov.in/Images/pdf1/TSP.pdf