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@Gordon
No, that sounds fine. A FET shouldn't really need a resistor - just make sure that at boot time you digitalWrite(0) to stop it floating, which could leave the sensor on/off.
Only thing I would add - are you powering the sensor from 3.3v, or from the LiPo? Because if it's from the LiPo you could hit problems - when the FET is off, the sensor will then be sitting at 3.7v (including the IO lines) which will be putting stress on the microcontroller. No problem if you're powering from 3.3v though