The 18-year-old put on a stunning display to send Nalkutan to the quarter finals as group winners, where they will enjoy home advantage in Port Vila for the draw.
Lae City Dwellers, one of the most impressive teams of the tournament so far, will also head to the quarter finals as runners up in Group A.
The Papua New Guinea side had brought back deadly strike force Nigel Dabinyaba and Raymond Gunemba to the starting eleven but it was Soromon who stole the show.
The youngster is rumoured to be heading to Europe for trials and on this showing he will be sure to secure a contract. He put the Lae City defence under pressure from the first minute, chasing a loose ball in the Lae City half.
At the other end impressive Solomon Islands winger Tutizama Tanito, who has two goals in two games so far, was equally dangerous and his cross was headed narrowly wide by Nigel Dabinyaba.
It was 0-0 at half time but Soromon took just two minutes to break the deadlock in the second half. He beat his marker and curled a shot past the goalkeeper to open the scoring.
Ten minutes later he scored a second with a fantastic free kick that curled in just inside the post.
Nalkutan stretched their lead to 3-0 after 60 minutes when Richard Manuriki scored a free kick and the Vanuatu side was coasting.
However, Nigel Dabinyaba is one of the best strikers in Oceania and he pulled a goal back for Lae City Dwellers in the 64th minute. He finished off a slick passing move to fire the ball into the corner of the net.
Nalkutan hung on and in the 90th minute 18-year-old Soromon headed his third of the game for a first ever Oceania Champions League hat trick. The exciting youngster starred as Vanuatu won the Pacific Mini Games in December and looks to be heading to the top of the game after another brilliant performance.
Nalkutan 4-1 Lae City Dwellers – Group ALineups