To detect movement you need to 'record' two 'images' spaced over a period of time, then compare the differences between the 'images'.
For example, if your sharp IR reads 25 one second then 202 the next, obviously something moved. You also know the change in distance, and the absolute distance, too.
However you seem to want a wide angle sensor, at least in the 2D and maybe 3D? And then know exactly where the movement occured . . .
Have you considered combining multiple sensors? For example, 5 sharp IR next to each other?
Depending on accuracy, field of view, and quality you require, a camera might be the best option. Just a thought . . .