The Iranian team had defeated Oman 2-1, Jordan 2-0, China 2-1 and Qatar in its previous matches.
Iran will face Thailand on Friday and will win the title if it defeats the host.
The 3rd Asian Youth Beach Handball Championship is taking place in Bangkok, Thailand.
This marks the third consecutive time that the competition takes place in Thailand, which has hosted the event since the inaugural edition in 2016. The championship features players born in 2008 and 2009.
Iran has already secured its spot in the Youth (U-17) Beach Handball World Championship, to be held in Hammamet, Tunisia, from June 17 to 22, 2025.