A spokesman said it was removing 400 price controllers from its operation. Price controllers check that prices displayed on supermarket shelves are correct. Their role will be carried out by other staff in future.
The affected Sainsbury’s workers, who have now entered a 45-day period of consultation, will be offered roles elsewhere in Sainsbury’s or redundancy.
All of the UK’s big four supermarkets, Tesco, Sainsbury’s, Asda and Morrisons, are seeking efficiency savings to finance price cuts so they can better compete with Aldi and Lidl, who have won the market share in recent years.