Some theses are available online as EDTs, but I didn't find this one. I also didn't find this for sale either. My best guess then would be to attempt to interlibrary loan (ILL) it from France, if you have a library that will do it. The other possibility is contacting the author directly:
Jérôme Schweitzer
Tel. : 03 88 25 28 44
Courriel : Jerome.Schweitzer@bnu.fr

http://catalogue.enc.sorbonne.fr/cgi-bin/koha/opac-detail.pl?biblionumber=89271&shelfbrowse_itemnumber=119055

Summary:

http://theses.enc.sorbonne.fr/2010/schweitzer