After retiring as a player, De Koning then became a goalkeeping coach for his former club AZ, also serving briefly as joint caretaker in 1997, and later on moved into head management at
Eerste Divisie, making his debut at such role with Limburgish club
Fortuna Sittard. De Koning then briefly served as interim coach of
Dordrecht from March to July 2005 From July 2010, De Koning was in charge of Eerste Divisie club
AGOVV Apeldoorn. In March 2011, it was announced that AGOVV and him had parted ways at the end of the season; De Koning was then unveiled later in May as new head coach of
Helmond Sport for the 2011–12 season. On 21 April 2012, it was confirmed that he would be in charge of Eerste Divisie club
Volendam for the 2012–13 season, signing a two-year deal. ==Honours==