How to say 'I wish I was there' in Spanish?
There should be several variants in Modo Subjuntivo Independiente using Ojala, Quien and Ya

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Ojalá estuviera allí.
Quién pudiera estar allí.
Ya me gustaría estar allí.

There are a lot of possibilities, all mean the same.

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Why so complicated? I'd say: Quisiera estar allí! 
Or: Como me gustaria estar allí.

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You probably meant to say, I wish I were there. English has a subjunctive also.

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hola come stes