The deceased were identified as motorcyclists Md Jewel Mia, son of Wahid Ali of Saudergaon village in Doarabazar upazila and Md Shobdar Ali, son of late Abdur Razzak of Hasannagar Moynar Point in Sunamganj municipality.
Locals said the accident took place around 11:30 am when the motorbike heading towards Jagannathpur collided with the Sunamganj-bound private car, leaving Jewel Mia dead on spot.
Shobdar Ali succumbed to his injuries on the way to Sunamganj Sadar Hospital, said Joykolosh Highway Police Station Officer-in-Charge (OC) Suman Kumar Chowdhury.