The 33-year-old, who has also played for Toulon, moved to Paris in 2010 but has become frustrated with his lack of opportunities in recent months.
"If anything, I have trained even harder since they stopped picking me. I want to be ready for what lies ahead of me," Sackey told The Rugby Paper.
"I have no regrets about joining Stade. I was so excited to be coming to such a big club known all over the world and I've loved living in Paris."
Sackey has made 22 appearances for his country.