The result means the defending champion Iran will face Japan, a FIFA Beach Soccer World Cup regular, in an eagerly-awaited blockbuster in Thursday’s quarterfinals.
In an entertaining encounter right from the start, Mohammad Masoumizadeh gave the Iranians an early lead in the fourth minute before Mushel al-Araimi leveled the tie with an absolutely sensational volley from deep in his own half to level the tie.
Jalal al-Sinani scored Oman’s second to give his team a 2-1 lead at the end of the first period.
After a goalless second period, Iran’s star goalkeeper Peyman Hosseini issued a warning when he rattled the crossbar with a volley reminiscent of his 2017 World Cup goal against Mexico.
Finally, the goal came as Masoumizadeh scored with an overhead volley that bounced wickedly off the sand and into the net to make it 2-2, and a superb Hosseini save from Al Bulushi's bullet ensured it remained that way moments later.
With the tie locked at 2-2 deep into the final period, two late goals from Sami al-Bulushi and Yahya al-Arami sealed a famous victory for the Omanis before Mohammad Ahmadzadeh pulled one back for the Iranians with 30 seconds left on the clock to give Marco Octavio’s men a last-ditch hope to force the game into the extra time.
Oman, however, held on to secure the top spot of the group and a last-eight meeting with Bahrain.
"It was like a final. It was two teams with very good technical conditions and I would like to give big congratulations to Oman. They deserved to win,” said Iran’s head coach Octavio after the game.
“The people who came tonight saw a very beautiful show of beach soccer. If we were watching this from the perspective of a scout, and judging things like possession and ball control, we would say Iran was the superior team, but Oman was more efficient, and I have to congratulate them for a beautiful performance. We are still alive in the competition and we will do our best to keep on and qualify," the Brazilian added.