The dead was identified as Mohammad Rubel, 40, a resident of Dighal Bana village in the upazila.
Bana union parishad chairman Humayun Kabir Babu said a group of people was witnessing a friendly football match at the school ground from the rooftop of the tin-shed building in the afternoon.
The building collapsed around 6pm when they were getting down from it hurriedly after the match, leaving Rubel dead on the spot.
The injured were taken to the Upazila Health Complex and Faridpur Sadar hospital, he said.
Meanwhile, Rakibul Hasan, 4, was killed and two people, including his mother Fatema Khanam, 34, were injured after a wall of their house collapsed at Rajuarghona in Maheshkhali upazila of Cox’s Bazar around 3pm, said Hoanak union parishad chairman Mostafa Kamal.