Yes, you can participate in the DNA Sephardic Project. All you need to take is a 12-Markers Y-DNA test. Order it from the following website : http://www.ftdna.com
If you have not been tested with FTDNA, log to their website and join the Project following the instructions below.
If have a DNA on file with FTDNA, you must login to your account and join the study from there.
Since we may not have all possible surnames listed in the Project profile it may not come up automatically when you click on a search button, however if you select the "S" from the Dual Geographic Project listing, the Sephardic projects will come up on the list and you can join immediately the Sephardic project.