Yes, Moen's Smart Sprinkler Controller is compatible with 3rd party hardwired rain sensors. To install, remove the cover to the Smart Sprinkler Controller and connect the rain sensor wires to the SN terminal of the Smart Sprinkler Controller. Once properly connected, log into the Moen Smart Water Network application, navigate to Settings, and tap the Device tile. Within the Device page, enable the toggle for Rain Sensor.
If you have questions or need help with installation of the wired rain sensor, contact the 3rd party manufacturer of the device.