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Actually nope. It takes more energy to slow yourself down enough to crash into the sun, starting from the earth, than it does to hop on over to the moon.

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Definitely a stupid question, because I actually have no idea how they work: can a solar sail be "tacked" so as to decelerate towards the sun, like a sailboat sailing into the wind?

(Setting aside the risky problem of getting this waste off earth and into space to begin with)

I have not done any calculations now, but given how small the solar wind is in drag, it would have to be a very, very big sail.

Tacking works because boats have a second "sail" interacting with a second fluid moving differently than the wind (the keel is in the water). There's no second thing to push against in space.

If you "tack" your solar sail, you'll spin.

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