Alamian defeated Uzbekistan's Zokida Kenjaev 4-2 (8-11, 7-11, 11-4, 11-4, 13-11, 11-7) in the final match.
Alamian will represent Iran at the Games after securing top spot in the Central Asia region men’s singles event.
The Olympic Games, which were postponed from last year due to coronavirus, are scheduled to open on 23 July to 8 August.