Police said the attack happened at 8.30am in Krawa village, Tambon Krawa, Mayo district.
Police said a unit of eight soldiers from the Pattani Taskforce 25 was patrolling the road to ensure safety for the teachers when insurgents detonated a home-made bomb with a mobile phone.
Private Jakkrit Jinarat, 22, was fatally injured and died at Pattani Hospital.
His friend, Private Jirasak Boonruang, 22, was severely injured.
Meanwhile in Pattani’s Sai Buri district, a Muslim couple was shot dead in their home late Thursday night, police said.
Police said Malee Jehmu, 54, and his wife, Bungo Jehmu, 51, were killed at their house at 11pm Thursday.
Police quoted eyewitnesses as saying that the couple was sitting in front of their home when two men arrived on a motorcycle and started firing.
The husband was killed in front of the house. His wife fled inside but was also shot.
Police said the couple’s son, a defence volunteer for Sai Buri district, was killed by insurgents in 2010.