Yes, it is possible for an object to have a non-zero velocity even if the net external force acting on it is zero.
This is because velocity is a measure of an object's speed and direction, while net external force is a measure of the total external forces acting on an object.
If the net external force acting on an object is zero, it means that the forces acting on the object are balanced, and there is no acceleration. However, the object can still have a constant velocity if it was already moving before the forces were balanced, or if the forces were balanced at the moment when the object was moving with a certain velocity. Once the object is moving at a constant velocity, it will continue to move at that velocity unless acted upon by an external force.
To summarize, an object can have a non-zero velocity even if the net external force acting on it is zero, as long as the forces were balanced at the moment when the object was moving with that velocity.