Does Apple watch se cellular model bought in Us works in india

Apple only sells Apple Watches, with hardware and software, specific to the country where it is sold. Different countries have different legal limitations.

Apple does not sell another county’s model across borders, and does not ship across borders, if you access another country’s Apple Store.

You can obviously carry your purchase across borders, but the hardware and installed software my have limitations in another country. In your case the cellular radio will not work.

To cover the LTE and UMTS bands used around the world, cellular models of Apple Watch come in regional models for the Americas, China mainland and Europe/Asia Pacific. Unlike iPhone, there isn't a worldwide Apple Watch model that supports all cellular bands used globally.

A cellular watch bought in the US will only work in North America,Canada,Mexico and Puerto Rico

From what I've read,no they won't.