Mr Goldsmith alleges that Sainsbury's chief executive Justin King reneged on a promise not to build a new store in Barnes, south-west London, despite local residents overwhelming opposition to the plans.
he proposed site on White Hart Lane is opposite the home of songwriter Sir Tim Rice and within Richmond Park, where prospective Conservative parliamentary Mr Goldsmith hopes to become an MP.
Campaigners fear the arrival of a supermarket in the centre of the leafy suburb, whose village-like charm has kept property prices among the highest in London, could crush the already struggling small, independent businesses in the area.
In the past six years, London is estimated to have lost more than 7,000 small shops because of supermarket competition, high rents and parking fees.
Sainsbury's bought the site in White Hart Lane last spring. It was refused planning permission by Richmond Council but had the decision overturned on appeal.
Mr Goldsmith, 33, helped the White Hart Action Group (Whag) to organise an independent referendum by Electoral Reform Services to poll people living within a mile and a half of the proposed store. Turnout was high and 85 per cent of the 4,700 respondents rejected the store.
Mr King agreed to meet residents and, according to Mr Goldsmith, agreed he would pass the site on to another business, provided it wasn't a competitor.
But when an organic grocery company came forward with an offer to match the yearly rental of £128,000 as well as providing a £30,000 premium, Mr Goldsmith claimed that Sainsbury's upped the price of the site to around £1 million as compensation for "loss of business opportunity".
"What Sainsbury's has done is totally unethical. It has misled us, wasted our time and put two fingers up at the community," the environmentalist said.
"This is yet another example of a big multiple using perverse planning laws to force itself on an unwilling community."
He has now called for the "most successful ever boycott" of Sainsbury's.
"This is a local issue, but it's also national. We have bent over backwards to make it easier for them to back off. Now we will take this as far as we need to."
In a statement to the Independent, Sainsbury's said: "As we have repeatedly stated, if a commercially viable proposition were put to us then we will of course give it proper consideration.
"No such offer has been received and we have not reneged on any deal. This development was subject to a very public planning process, including a public inquiry, which has given local residents the opportunity to voice their opinion. We have received messages of support from local residents and we believe it will benefit the community."
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