Union of India has a number of tribes. They are called Scheduled Tribes. These tribes live on areas that are reserved for them. There are several Indian federal laws that govern these reservations. Unlike Sentinelese and Jarawa tribes, the tribes that live on reservations in inland India are not very isolated. So, it was easy to assimilate them into India.
The procedure that was used to assimilate isolated Jarawa tribe on Andaman & Nicobar islands into mainstream India was 3-part.
1. Indian anthropologists spent some time to learn their language. Then they safely interacted with them minimizing risk of disease.
2. After that, the Jarawa tribe came in the care of specially trained Indian Forest Services personnel. They trained the tribe on speaking Indian national language, cooking food and wearing clothes.
3. Then, they were given reserved land where they live. All of these reservations host Indian military installations, particularly of Indian Navy. So they are very well protected.
This is the same procedure that is being used to integrate Sentinelese. It will take some time. It will happen. Superstitious religious people ("missionaries") need to stay away from the Sentinelese tribe.