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1. Implement a TCP/IP stack and use the FTP protocol to transfer files to the sdcard. This method may seem cumbersome but since you have a ethernet port on the system a TCP/IP stack may be the best solution.
2. Instead of implementing TCP protocol, which is quite complicated, you could use UDP instead and make your own file transfer procedure.
I have developed a system that uses a SDCard and ENC28J60 driver IC interfaced to a PIC 18F2620 mcu, this system uses UDP for data transfers. To implement UDP connectivity you need to add other basic protocols like ARP,ICMP etc.
The system I developed connects via ethernet to a wireless router, I use a laptop to access the device (uses a static IP address) and download data from the SDcard.
The above solutions would be very easy to develop if you have ready made stack for the mcu you are using.
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