After his active career, Sönksen became a trainer and accompanied the German team as Equipe-Chef at international competitions. He had a great influence on the development of young riders, especially after German reunification. His commitment and respect for horses were central to his work.

For his achievements he received prestigious awards, including the German Riding Cross in Gold and the Meteor Prize. The equestrian world remembers him as a legend who left his mark on the sport with dedication and kindness.