Assuming your motion sensor is similar to this:http://emartee.com/product/42196/
You need to power and ground the sensor and read the TTL output from the sensor.
To do this you need to use a digitalRead command:http://arduino.cc/en/Reference/digitalRead
The sensor outputs high when no obstacle is detected, low if an obstacle is detected,
I think if you soldered wires to the pins on the sensor you could get away with not using a breadboard, but I would strongly recommend getting one, especially if you have 37 sensors to figure out...