Hicks, 39, takes up the position next week. He will oversee output on the group's two Heart and five Galaxy stations.
Galaxy 101 managing director Mark Flanagan takes the new role of regional managing director across the group with day-to-day responsibility for all stations outside London.
Regional sales director, midlands and south-west Dianne Hall, who has been with 100.7 Heart FM since its launch in 1994, steps across to replace Flanagan as Galaxy 101 managing director.
Hicks joined Chrysalis Radio in 1997 as programme director of Manchester station Galaxy 102, before overseeing the launch of Galaxy 105-106 in the north-east.
In 1999, he returned to Galaxy 102 as managing director. His replacement at Galaxy 102 is the managing director of Yorkshire-based Galaxy 105, Matthew Levington, who himself has yet to be replaced.