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I'm guessing it's going to be difficult to persuade it to straighten out without some combination of heat and moisture? It's about 8mm out over the 2m length.
rhowe-
I'd start off with clamping it to a solid, flat surface for a day or two. If that doesn't work repeat with a shim in the centre of the bow so that you're bending it past the resting point. You're unlikely to get it 100% but should manage most of the way there. I can't guarantee that you won't crack the new finish.
Bobbo
Any time you strip wood you allow it to absorb moisture which can potentially lead to movement.
Also if you left it leaning between the top and bottom gravity could help it decide to bow, especially if it's been like that for a while.
Finally if you sanded particularly vigorously (or applied too much pressure with a sander) and the wood had a high moisture content you could generate enough heat to soften then lignan in the timber and effectively steam bent it.