Check out the Al-Madinah Int'l University PhD in Islamic Banking and Finance. It appears to be an program that could be very attractive to aspiring Shari`ah advisors, particularly those who are have strong English-speaking backgrounds and have completed Masters' degrees (or have Masters' equivalent training) in Islamic studies at traditional seminaries (e.g. the Nizamiyya madaris in the South Asian subcontinent or diapsora) or in an Arabo-Islamic college or university. Thanks to  Sh Moustafa Kassem, our newest associate, for bringing this to our attention.