There are other non-present day people groups occupying the Andamans and Nicobar islands, however they have, to different degrees, been in contact with current individuals. Not the Sentinelese. A few people have been executed by the Sentineli while attempting to reach them. The Indian government has ventured to such an extreme as to make the island forbidden and travel there is denied.
As of late as 2018 a Christian minister lost his life attempting, illegal and nearby travel confinements, to go there and coloniali—I signify 'convert' them. His body was left on the island as it was not practicable to recover it.