No, the velocity of an object cannot change without changing either the magnitude or the direction (including angle) of its motion. Velocity is a vector quantity that combines both speed (magnitude) and direction. Any change in velocity implies a change in either the speed or the direction of travel, or both.
If the magnitude of the velocity remains constant but the direction changes, the object would experience a change in velocity because the vector representing its velocity has changed. Similarly, if the direction remains constant but the magnitude of the velocity changes, there would still be a change in velocity.
For example, if an object is moving in a straight line and then suddenly speeds up or slows down, its velocity has changed even though the direction remains the same. Similarly, if an object is moving in a curved path and maintains the same speed but changes its direction, its velocity has also changed.
In summary, any change in velocity implies a change in either speed, direction, or both.