and there's a document there that has something about using multiple sensors on one bus:
http://www.mouser.com/catalog/specsheets/D6T-01_ThermalIRSensor-Whitepaper.pdf
Seems to me the easiest way to multiplex them would be to put a CD4051 on the clock line and use up to 3 GPIO pins to select which of up to 8 sensors receives the clock. The only tricky bit would be making sure the clock is at the right level when the switching tales place, you might need ~10k pullups to 3.3V on the sensor clock pins.
Yes, it even works as an icecube detector!