I'd love sooo much to be wrong on this, or, "confused". In addition to needing a broker with the capabilities... You need to not reside in the U.S. (according to Uncle Sam). Of course you could just be a QIB, no biggie just have to own and invest on a discretionary basis at least 100 million dollars, peasants need not apply tho.
The issue is that the SEC (or maybe it's the CFTC, don't recall exactly) requires for foreign equity and index options products to be available to US residents the respective foreign exchanges where those products are traded have to register with the SEC. None of them have done that. Unconstitutional? Not directly, nobody is preventing you from buying/selling, they are just preventing the exchange from legally offering you the product.
This is all from IB, and once they did provide a link to the rules but I cannot for the life of me find any such source today on the internet. I re-contacted IB today and got the whole shpeal all over again.
I realize that presenting this w/out a link to rules does not come forth are genuine, but if you are interested in the subject and are an IB customer (or other broker w/ int'l capabilities) you can simply attempt to get set up to trade foreign options, see what happens.