Hello Alexandre,
there do exist some maps in different books- but they might all not be too usefull for you. It depends on what informations you need. There are two difficulties:
1.) Taxonomy. The whole genus should be revised. There are several subspecies described, that are maybe not valid. Some authors accept them, others don`t.
2.) Locations. There are not many locations where leopardgeckos have been found being published, so all maps are very vague. Big parts of the habitat aren`t the safest places in the world,...
As you are from switzerland, you can maybe read german texts. You should be able to get the following book through your library- or you do me a favour and buy it

On Page 22 taxonomist and veterinarian Dr. Köhler published a map with the location of the five species.
http://herpeton-verlag.de/index.php?action=titelzeigen&titelnr=10011&detail=innenansichten
In this book (Henkel, Knöthig, Schmidt:
http://www.amazon.de/Leopardgeckos-...0550462?ie=UTF8&s=books&qid=1185750725&sr=8-2) you can find a slightly different map on page 13.
I don`t know any map that visualizes the locations of the subspecies. In our book we do only accept E. m. macularius and E. m. afghanicus as valid subspecies. There are indications, that there might be other subspecies, but todays datas on pholidose do not make a clear decision possible.
I hope this helps
Karsten