Hi.
First off, you would have much more chance to get a proper response by posting in a 3D-printer-forum.
99& of the members in here won't know what a RAMPS-board is. Fortunately I do know.
Yes, you can hook it up to the RAMPS-board. Use one of the three thermistor-inputs. They do have a 4k7 pull-up resistor on them, but that shouldn't affect the operation of the sharp sensor.
The schematic for RAMPS 1.4 is here
// Per.