--is that you have a condition that affects your nervous system on some level, with both sensory and motor components.

Generally, in neurology, the convention has been that the more severely impacted system is listed first. So, by labeling it a "sensorimotor" disorder the implication is that your sensory systems are affected to a grater extent than your motor nerves, but both are involved.

It's really not a very explanatory term--it says nothing about cause or severity.