Jimtown High School teacher Mike Hosinski hit the student during a confrontation on Feb. 25 about a hooded sweatshirt the student was wearing in class, according to a release from Baugo Community Schools in Elkhart.
The district released surveillance video that shows the teacher grabbing the student by the backpack and pushing the student against the wall.
The teacher then stands over the student, pointing his finger at them before slapping them with his hand. The student then falls to the ground as the teacher attempts to guide them down the hallway.
The slap caused the student's head to hit the wall and the student suffered visible injuries, the district said.
On Monday, students walked out of class.
The incident is being investigated by the Indiana Department of Child Services and the Elkhart County Sheriff's Office.