Sure can. I use 2 motion sensors to control the same light. There are 2 ways to do that (with X10 anyway).
- Set motion sensor to the same address
- Set motion sensor names to same base name
If you set both/all motion sensors to the same HC/UC then any motion will be reported as the same motion sensor in HG and will operate the light(s) as though it was a single motion sensor.
Or, if you set the linked motion sensors to the same base name, then the code will be able to use them all and you get to see them as separate sensors in HG (e.g., "south motion 1", "south motion 2", "south motion 3", etc.). I use this approach.
If you use either approach, make sure you set the code to "motion triggers on ON" so that OFF signals from an area you moved out of do not cause the lights to go out on you when you are in a different sensors zone.
If you want to have multiple lights controlled by the same sensors, just use the same setup on multiple light modules. You will have to duplicate the settings, but it works just fine.