Sadly mod support for Civ BE is looking even poorer than for Civ V. They haven't even released the World Builder for Civ BE yet.
A requirement for a Dune mod would be to be able remove the Ocean, have units moving on the old sea-bed, reskin the terrain, alter the height maps, etc. Most of this is not possible with Civ V/BE which is one key reason why no total conversion mods have been made. We can only hope for more mod-able terrain and much improved mod support whenever Civ VI arrives.