Sancho, who has been at the club since January after arriving from Manchester United, played in a 5-4 aggregate win over Atletico Madrid.
Playing 86 minutes of the second leg, which Dortmund won 4-2, Sancho posted on social media after the game: SEMI FINALS! Great fight from the team today!"
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Sancho and Dortmund's result means that Germany could be getting an extra Champions League place as well.
Italy top the coefficient department, while Germany are in second, with England in third.
As it stands, only the top four Premier League clubs would qualify for the Champions League for next season.