getting start with isis

how can i get a sim808 in isis logiciel

From what I gather you are trying to find a footprint or design block for you Circuit board Software "isis logiciel"?
In my quick research, I couldn't find anything like that so I am suggesting you manually make a footprint or use a different designing software like Eagle CAD, which is by far the best free circuit board software.

If I didn't answer your question... sorry and please clarify yourself.