Two CRPF personnel, one policeman and two civilians were among the injured.
The incident took place at 9:35 am. The injured were taken to hospital, a senior police official said.
On Thursday, militants hurled a grenade at a senior Jammu and Kashmir minister's cavalcade in Tral , killing two civilians and injuring six people, including two policemen, police had said.
Jammu and Kashmir Minister for Public Works Naeem Akhtar, who was on a tour of Tral, had escaped unhurt in the attack.
"The grenade was reportedly hurled at 11.45 am," a police official had said.
J&K: Grenade attack near #SBI branch in Sopore in Baramulla district. 3 people injured.More details awaited— ANI (@ANI) September 24, 2017
He had said two people -- Ghulam Nabi Trag (56) and 17-year- old Pinky Kour -- were killed, while six others including two policemen were injured in the blast.