Is Indian sandwich bread meant to always be grilled or toasted?
As Jefromi already mentioned in a comment, the sandwich bread common in the Western part of the world is soft and often sweet, ready to eat.

When you search online for 'indian sandwich bread' you will only get images of roasted bread with various fillings.

I think the bread you refer to is in a half baked form, which you can find in supermarkets here sometimes too: it is used here mostly for baked sandwiches with cheese. The bread is only ready when going through another baking cycle.