Since Disney acquired 20th Century Fox, The Day After Tomorrow is available on in India. Subscribers can watch the film in multiple languages, including Tamil.
Let’s be honest for a moment. A Tamil-speaking viewer in a rural town doesn't search for "Isaimini" because they hate cinema. They search because of three failures of the legal system: the day after tomorrow tamil dubbed isaimini
If you decide to proceed with legal streaming (highly recommended), here is your viewing guide for maximum enjoyment: Since Disney acquired 20th Century Fox, The Day