It is the first retailer to partner Simplifydigital, which and has so far been promoted by newspapers such as the Daily Mail and the Daily Telegraph.
Called 'Sainsbury's Compare and Save in association with Simplifydigital', the phone and web-based service will help support the chain's growing non-food offering.
Sainsbury's will raise awareness of the service through shelf-fins, leaflets and car park posters initially in 86 stores, leading to a full rollout in all 504 supermarkets over the next nine months.
It will also promote it online with a dedicated , which links to Simplifydigital's recommendation engine, and with direct marketing to Nectar cardholders.
Adam Zeiderman, commercial manager at Sainsbury's, said: "Simplifydigital offers a totally unique service - they make the complex world of digital TV, broadband and home phone simple; they offer real choice and they save customers time and money, which is why they are the ideal choice as partners."