The court imposed the sentence after finding Luca Cobre, the manager of a hotel in Medjugorje, guilty of organised crime.
Medjugorje is a small village where a shrine marks the apparitions of the Virgin Mary that six young people saw in 1981.
The extortion group allegedly threatened to close Italian tourist agencies or non-governmental organisations in Medjugorje and expel their owners if they did not pay.
Its members also allegedly tried to force pilgrimage tour operators to rent their hotels.