I have a large Java app that is split up into multiple projects. Each project has its own folder in a Subversion repository like so:
AccountingCore
If you have a shell, you could enter
for DIR in AccountingCore Common WebCommon; do mkdir $DIR; cd $DIR; git init; git svn init -s svn://host/path/$DIR; git svn fetch; cd ..; done
That is, if I made no mistakes.