You can get 1 Gbps internet speed in India by subscribing to any of the broadband providers in the country offering 1 Gbps plans.
1 Gbps plans are offered by Airtel, Jio, Spectra, Tata Sky, and ACT. Although, you will have to check on their website or call their customer care representatives to know further about the availability of a 1 Gbps connection in your area.