كتب : Omar AbdelAziz
The Egypt number one conceding a goal after nine minutes before receiving a straight red for bringing down a Vaduz striker two minutes later.
However, Saidu Adeshina and Olivier Monterrubio put Al-Hadari's side on front with two first half goals.
Al-Hadari, who has just returned from a serious facial injury, will miss the next two games against FC Zurich and Luzern.
The win lifts Sion to fourth with seven points, five points adrift of leaders Aarau.