The manager was fined 10,000 kronor ($1,352) on Monday for the unprovoked attack, which took place in March this year.
Witnesses reported that the man emptied a bucket of water on his store's windows so forcefully that a nearby beggar became drenched.
The man repeated the dousing four times, Gothenburg District Court noted. The court ruled that the action did not constitute a hate crime, as the manager claimed he wasn't aware of the beggar's Romani background.
The case has been popular in Sweden ever since a witness posted the story online – a post which quickly became viral. The supermarket chain Hemköp issued an apology soon after.
The beggar's lawyer reported that her client was satisfied to learn the manager had been convicted, but also that her story had been believed.