Following the Lance Armstrong doping scandal, the British team asked riders and support staff to sign up to a written statement saying they had no past or present involvement with drugs.
Dutchman de Jongh and race coach Bobby Julich then left in October after admitting to taking banned substances earlier in their careers.
But the 39-year-old, who spent his career with the TVM, Rabobank and Quick Step teams, has found a job at Bjarne Riis' outfit.
"I got in touch with Steven, and throughout our conversations I felt he would be a great fit for us. On top of that I have heard a lot of good things about him as a sport director, and he brings a solid amount of experience to our team," Riis said.
And de Jongh is relishing the task.
"I'm thrilled to have the opportunity to start working for Team Saxo-Tinkoff and one of the best rider line-ups in the world," he said.
"After I left Team Sky, I simply didn't know what the future would hold for me. But in early January I had some conversations with Bjarne and the team, and this developed into a job offer and a fantastic opportunity for me personally. I'm really looking forward to start this new chapter of my career as a sport director, and I'm grateful for the confidence the team has shown me."
De Jongh joins Philippe Mauduit, Dan Frost, Tristan Hoffman, Fabrizio Guidi and Lars Michaelsen as sport directors.