Earlier there were F&O contracts on Nifty IT, but were discontinued last year as there was very less participation.
Other than Bank Nifty another sectoral index where F&O contracts are available is Nifty Financial Services Index, you can add these to your marketwatch by searching for FINNIFTY.
Adding to the above answer, there are no other Sector-specific Future/Options contracts but there are Interest Rate Futures (For G-Secs, T-Bills and MIBOR). These are traded but have very low volumes
There used to contracts for Nifty Infrastructure, Nifty CPSE, Nifty PSE, and Nifty Midcap 50 Indicies but those were discontinued.