Installing outdoor light fixture. Fixture has a white, a black and a green ground wire.
There are two switches and a sensor in the garage. The wiring on the wall outside the house to the fixture has a red, a black and a white wire. How should the wires be connected for proper operation of the two switches and the light sensor?

Most need the black and white to have power or switched power to the fixture, and when It detects motion or gets dark(whichever sensor used), then the red is usually out to the bulbs themselves.
Why 2 switches?

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There are two switches and a sensor in the garage.

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What does each of the switches do?
What kind of sensor, motion detector or what? Not usual to have sensor inside garage for outside light.

Are there any other outside lights?

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The wiring on the wall outside the house to the fixture has a red, a black and a white wire.

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Is that all the wires in the box?