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It doesn't look like a Wood Sand to me - the bill is too long, the supercilium doesn't extend beyond the eye and the pattern of the back and wing feathers doesn't feel right.
I'd probably go for Greenshank though the bill seems too straight and the legs unusually yellow.
I don't know the Asian wader species very well though and haven't checked the books, so don't know if Nordmann's Greenshank can be ruled out - it's very rare but the photo was taken in the right part of the world for it.
A number of features confirm this as wood sandpiper:
yellow legs - wrong for greenshank
straight bill - greenshank's is very slightly upturned, and longer
streaked breast - greenshank, if it shows any streaking, will tend to extend further down and not form a distinct breast band as here
Also marsh sandpiper has a much finer bill.
This looks like an adult in faded post-breeding plumage to me.
The bill still looks too long to me for a Wood Sand. As noted on my initial comment I agree the bill shape and leg colour are wrong for Greenshank, but I have seen photos of Greenshanks where the bill appears straight and photos where the legs look yellowish. However I have to admit that it's unlikely both anomalies would show up on the same bird, and also on reflection the legs on this bird are more yellowish-orange - I don't remember ever seeing Greenshank with legs looking this colour.
The bill would appear to rule out both Yellowleg species, so I guess it must be a Wood Sand and either the bill is longer than average or I'm just imagining this feature! Faded plumage would explain the lack of a supercilium which was the other feature that made me think it wasn't a Wood Sand.
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