A vehicular cabin monitoring system includes a radar assembly disposed in a cabin of a vehicle and operable to capture radar data. The radar assembly includes at least one radar transmit antenna that is operable to transmit radar waves and at least one radar receive antenna that is operable to receive radar waves. The transmitted radar waves are transmitted at least to a hotspot zone in the cabin of the vehicle. A data processor is operable to process radar data captured by the radar assembly. The system, via processing at the data processor of radar data captured by the radar assembly, determines movement within the hotspot zone of a body part of an occupant present in the cabin of the vehicle. The system, responsive to determining movement within the hotspot zone of the body part of the occupant, generates a control command.