Is there any chance to have SH3D to run on Web OS ?

After a quick search, it doesn't seem that WebOS supports Java. So it would be too much work to rewrite Sweet Home 3D for this operating system and, as long as the future of Web OS doesn't look clearer, I won't try to support it.
But there might be some chances that you can view a SVG file or OBJ file in WebOS. At least, you could export your home and view the result on your pad even if you can't change it.