There isn't any built in support for ODS files, so you will need to either implement this yourself or find a third party solution. I don't know of any to recommend, but somebody else may or you can try searching.
ODS files are zipped XML, so you should be able to unzip with the ZipArchive class and then use XmlDocument to read it. You'll need to check with OpenOffice for details of the schema within the XML.
--Rob