She was presented with the accolade by Oh Yeah Music Centre, Belfast’s dedicated music hub, at a ceremony on 14 November at the city’s Mandela Hall.
Her debut album, Before We Forgot How to Dream, was selected by a panel of music and media figures for the prize.
Stuart Bailie, chief executive of Oh Yeah, said: ‘There were many great records on the shortlist this year, but we’re delighted that SOAK was the winner. It’s a remarkable statement and a milestone for Northern Ireland music.
‘The Sound of Belfast programme has once again shown so much amazing potential from our music makers and SOAK is one of the artists that will take us into the future.’
Also at the event, Divine Comedy, led by Neil Hannon, received the Oh Yeah Centre’s Legend Award.
It was presented by Stuart Fleming from PRS for Music, the organisation which sponsored the award.
The awards ceremony marked the end of The Sound of Belfast programme, which featured 27 events in nine days and involved seven different locations across Belfast.
It attracted over 5,000 people to experience live music from Northern Ireland, introduced around 50 industry professionals and trade bodies and generated over £250,000 of income for Belfast.