There was a British company called Chess International Aviation that was to buy one or two SPs and fit them out with VIP interior and offer these on world wide charter flights. This was a couple of years back, but am not sure on the current status of the company.
QF still operates the SP, and even used them on domestic flights, as well as some international flights, although they are currently looking at retiring these.
Other airlines to still operate the SP include South Africa, Syrian Arab, Air China, Iran Air, Iraqi Airways (when they are operational), Air Gulf Falcon, Corsair. I know that various oil sheikhs use SPs in their VIP fleet, including Dubai Air Wing, Abu Dhabi Air Wing, Bahrain Rulers' Flight, Royal Omani Air Wing, Saudi Arabian Airlines VIP Flight. Are there any other operators of the SP out there at all?