As I understand it, Oppos (and some other players) have two setting for SACD. One is to set it to bitstream, in which case, the SACD/DSD digital stream will travel over HDMI into whatever the next component is (typically a receiver). Most receivers will play SACD by converting it to PCM and playing it (at varying resolutions, depending on the receiver). Some receivers will convert the DSD directly to analog and play it. There's a great debate on various sites on which sounds "better."
Alternatively, you can set the SACD player to PCM in your player. In this case, the player converts the SACD/DSD digital to PCM. If played through the analog outputs of the payer, it will then convert it to analog and play. Or, it can be transferred over coax, optical or HDMI to the receiver and decoded to analog there. Some players (the Oppos, I think) can convert the DSD digital directly to analog. This is useful because you can have the system set to bitstream (which will pass the DSD digitally to the receiver to decode), while if you switch to a different input that has the analog cables, the Oppo will convert and play over the analog outputs. My Cambridge 752bd converts DSD to PCM, but upscales it to 192/24, before converting it to analog, so I have to choose between bitstreaming (receiver decodes) or PCM (the player upscales and decodes).
My understanding is that coax or optical cables don't have the bandwidth to transmit the DSD stream digitally - it can only go via HDMI. So I don't think that you can do want you want to (at least without a non-normal process like others here have suggested.
