Yes, you just need to write a maven or ant script to check the last of SVN first, then run the sonar command: sonar.
It seems that Sonar forces you to create a pom.xml file and install maven2 even for an unmotivated project: http://docs.sonarqube.org/display/SONAR/Analyzing+Source+Code
(fyi - Sonar , Sonar . .)