A lack of communication between Evans and Partick Thistle defender Stephen Craigan lead to Scotland's second, with Kevin Kyle pouncing on James McFadden's cross.
Crewe Alexandra froward Steve Jones pulled one back for Northern Ireland in the 57th minute, but it was little more than a consolation strike.
Scotland `B`: Paul Gallacher (Dundee United), Graham Alexander (Preston North End), Gary Naysmith (Everton), Christian Dailly (West Ham United), Steven Caldwell (Newcastle United), Gary Caldwell (Newcastle), Paul Devlin (Birmingham City), Brian Kerr (Newcastle), Kevin Kyle (Sunderland), Don Hutchison (West Ham), James McFadden (Motherwell).
Subs: Kenny Arthur (Partick Thistle), Andy Gray (Bradford City), Maurice Ross (Rangers), Darren Fletcher (Manchester United), David Noble (West Ham), Simon Lynch (Preston), Derek Soutar (Dundee).
Northern Ireland 'B': Tom Evans (Scunthorpe United), Michael Duff (Cheltenham Town), Stephen Craigan (Partick Thistle), Gareth McAuley (Coleraine), Grant McCann (Cheltenham Town), Steve Jones (Crewe Alexandra), Danny Griffin (Dundee United), Tommy Doherty (Bristol City), Stuart Elliott (Hull City), Andy Kirk (Hearts), Andy Smith (Glentoran).
Subs: Elliott Morris (Glentoran), Shaun Holmes (Wrexham), Wayne Carlisle (Bristol Rovers), Rory Hamill (Coleraine), Gary Hamilton (Portadown).