Fair-weather wind and wave activity will eventually carry the eroded sand back to the beach. Beach recovery takes months or years, though, because the lower energy waves don't carry as much sediment.
People Also Ask
What's the situation in the UK? Removing any natural material - including sand and pebbles - from public beaches in the UK is illegal under the Coastal Protection Act 1949. It up to local councils to enforce the law, and offenders can be fined up to £1,000.