In a voting process conducted by the club, Simon won 62 per cent of the votes to beat Nicolas Pallois, Mehdi Abeid and Andrei Girotto to the award.
Simon scored four goals for Nantes in October including a hat-trick in the French Cup win against FC Paris.
The fomer Gent of Belgium player who joned Nantes on loan from Spanish club Levante in the summer has scored two goals in 10 league games