16-year-old Bynoe-Gittens has agreed a long-term contract with the Germans and will initially play for their under-19 side.
Like Sancho, Bynoe-Gittens is an exciting attacking player with enormous potential.
BVB sporting director Michael Zorc expressed his delight at the signing, but asked for patience.
“Jamie Bynoe-Gittens is now with us and we’re pleased that he has joined our youth department,” Zorc said earlier today. “He will initially play with the under-19s. Our scouting department did an excellent job!
“He’s a highly talented offensive player, but he should develop patiently with us in the junior division. We don’t want expectations to be too high right from the start.”
Bynoe-Gittens, an England youth international, admitted that he hopes to follow in Sancho’s footsteps.
He said: “I’m going to try and make a name for myself. When Sancho was at City, he was doing bits in the 18s, scoring every game, so in a way, I want to be like him.
“You’ve got to take stuff from other people to make the best version of yourself. You’ve now got to score and assist to be the best.”
Bynoe-Gittens is the third English player on the books at Dortmund, after Sancho and summer signing Jude Bellingham.