Hastings Countdown has been banned from selling alcohol for 10 days after a minor bought liquor there.
The ban followed a purchase operation in June, which revealed the store had illegally sold alcohol to a person under 18 years of age. It was the third time it had been caught selling alcohol to minors.
The Liquor Licensing Authority suspended the store's off-license from 7am on Monday, November 5, to 7am, Friday, November 15.
Hastings District Council community safety manager Philip Evans said it was disappointing underage customers were able to buy alcohol: "[The] council will continue these operations and will seek the suspension and cancellation of licenses where appropriate.
"The suspension of the liquor licence would impose a significant penalty on the supermarket.