Customers will be rewarded at the till with money-off coupons for both branded and own-brand products.
Sainsbury's investment in the scheme will run for five years, giving away more than one billion coupons in store.
The Nectar card will be used as part of the scheme, with data on customers' shopping choices allowing Sainsburys to target its offers.
The initiative has been trialled in a number of stores over the past year, but the first major push will coincide with Sainsbury's latest Switch and Save campaign, which launched on 23 September.
Those customers which are not Nectar card holders could also receive money-off coupons based on what they have purchased that day.
The coupons will be given to customers at the tills with stand alone printers currently being rolled out to 13,000 checkouts across 535 Sainsbury's supermarkets.
Gwyn Burr, Customer Director, said: '"We know that 50% of shoppers take coupons and vouchers with them when they shop, and it's a really practical way for people to stretch their budgets, especially in the current economic climate.'
The supermarket said that the scheme will be fitted in all stores by November, with Unilever, Procter & Gamble and Heinz have signed up.
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