The appointments follow last week's boardroom coup, in which SMG's existing board and chairman Chris Masters were ousted.
The coup, instigated by Hanover Investors, marked the end of merger talks between SMG, owners of two Scottish ITV franchises, Virgin Radio, Pearl and Dean and Primesight, and UTV, TalkSport owners.
Rob Woodward, former Channel 4 commercial director, was named SMG chief executive, the first since Andrew Flanagan resigned last July.
Other new board members include Richard Findlay, former chief executive of Scottish Radio Holdings, as a non-executive chairman in place of Masters, and Matthew Peacock, principal of Hanover Investors, who was made a non-executive director.
SMG's board has postponed the announcement of the group's preliminary results for 2006 to 12 April.
Plans to sell Primesight remain unchanged and buyers for Pearl and Dean have yet to emerge.