Hi Kartu and welcome to the forum.
The oil filter # is 15410-kyj-901.
I have no idea whether an R15 filter is compatible but I would not risk it unless someone here can confirm their compatibility. If you should get the original one make sure to install it correctly. It can be installed backwards and that straves the top end of oil leading to engine failure.
I'm afraid I don't know any websites that send their items to India but I'm sure there are some. We have quite a few Indian riders here so maybe one of them can help you out. Also every Honda dealer (and probably most independent motorcycle repair shops) should be able to get parts for you.