Three police officers were found guilty of destroying evidence and sentenced to five years in prison.
The victim, who belonged to a Muslim nomadic tribe, was found in a forest near Kathua city in January 2018.
The case sparked widespread anger and made headlines when Hindu right-wing groups protested over the men's arrest.
Eight people, including a former government official, four policemen and a minor, were charged in connection with the crime. One of them has been acquitted and the minor is set to be tried separately.