Is it possible to set off motion-sensors remotely?

I have the Ring Alarm-system installed in a closeby building used as storage. Recently I had a motion-sensor (2nd gen) being set off in a sealed off room with no heatsources and windows blinded. Living nearby I arrived within 3-4 minutes to inspect, and observed one shady individual running off from the building into a waiting car as I arrived. It is in a rural area with a passing road, an area where one hardly ever observe people other than locals on foot. There was no sign of attempted break-in, but I wonder if those people were testing if anyone actually is monitoring the place. Is it possible to set off a motion-sensor remotely with RF-interference or similar? I noticed that the alarm-hub had registered a weakened signal from the sensor that was set off although this has never been a problem before or since.