Is there an alternative to lasik for thin corneas?

Yes. Yes. If you are unable to have lasik due to thin cornea, a phakic intraocular lens may be considered.
ICL surgery. Implantable contact lens surgery with the visian icl is a great alternative. Info available at www.2020vision.Com.
Yes. Another alternative is prk, depending on how thin is the cornea and the prescription being corrected.