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Yes, you can dye polyester but you need special dyes. iDye Poly is the only one I am aware of that is available to the home hobbyist, and I don't know how well it works.
iDye Poly products are colour-matched to the regular iDye dye products (for cotton), and you can use both together in the same dye bath for a 50/50 cotton/poly item.
None of the following will work on polyester: RIT, Dylon, Procion MX (including Dharma Fibre Reactive dye), Procion Acid (aka Jaquard Acid).