There are three Sheratons:

The Tel Aviv Sheraton Hotel and Towers
The Sheraton Moriah Tel Aviv
The Sheraton City Tower

The first two are on Hayarkon Street, on the beach, and close to all tourist areas.

The last one is not in Tel Aviv itself but in the adjacent city of Ramat Gan, near the Diamond Exchange. This is the one which is close to the train station, is convenient for businessmen, but is not really advisable for tourists.