from where the black(*****) race came to Andaman island India?

Answer 1

The indigenous Andamanese peoples have lived on the islands for thousands, if not tens of thousands, of years,and remained undisturbed until the mid-18th century with arrival of immigrant settlers and indentured laborers mainly from the Indian subcontinent. They are classified as Negrito.
http://en.wikipedia.org/wiki/Negrito

Answer 2

From Africa,(we all come from there) at least that is the latest that anthropologist say.