It happened outside a convenience store in Abbotswood at about 15.35 GMT on Friday 4 November.
The man is reported to have assaulted the nine-year-old, who was on his mountain bike at the time. The boy fell to the ground but fortunately did not sustain any physical injuries.
Officers are now keen to trace the man pictured, who visited a nearby shop around the time of the incident and may have information which could help.
If you can help, please call 101 and give the call handler the reference number 5222266465.
