Colorado Rapids have opened negotiations with the 22-year-old Koomson who is said to be keen on leaving the Norwegian league for improved wages.
Koomson is hopeful of joining a host of Ghanaians in the MLS by the close of the week.
Sources close to the deal told Ghanasoccernet.com that the two clubs have agreed a fee for the move to materialise.
The relegated Norwegian side will receive an amount of $600,000 as the transfer fee for the Ghana international.
Koomson had a very good season for Sogndal in 2016 by scoring three goals and ten assists.
He topped the assist table in the Norwegian top-flight league with 10 assits, close to him was Rosenborg's Jonas Svensson, who had nine.
Komsoon had his debut call-up to Ghana's national team last year, but is not part of coach Avram Grant's squad for the 2017 African Nations Cup.