Go to Google and enter "Indian Restaurants in Nagoya" and you'll find them. I found this:
Two very good Indian restaurants in Nagoya. The name is INDUS. Both with same name, in Sakae Area, one in Princess Garden Hotel: 1F Ph No.-052-261-8819; the other opp. TV tower in Tatenomachi Bldg.2F ph no. -052-971-0897