It seems that such a thing is nowhere to be found. Google only returns sites that promises everything but delivers nothing - great big advertisements to sell stuff. Even the Toshiba site came up dry. It may be hidden there, but there's nothing on the page for the 2SK711. 
http://www.semicon.toshiba.co.jp/openb2b/websearch/productDetails.jsp?partKey=2SK711
http://www.semicon.toshiba.co.jp/openb2b/websearch/productDetails.jsp?partKey=2SK711
Put the Id vs Vds chart from the datasheet on your lap, plug in a JFET of known parameters into the simulator and perform DC sweep. Change the parameters until you've got a set which resemble those in the datasheet. It only takes a couple minutes.
The standard SPICE model of the 2SK170 in my simulator (Multisim) seems to be for a "V-Grade" device so I adjusted the parameters until I get the Idss for the BL and GR varieties -- copy these down and use for your own device library. It's nice if you have a curve-tracer to check your work, but you can do the same analysis with a pair of power supplies and a DVM and graph in Excel.
The standard SPICE model of the 2SK170 in my simulator (Multisim) seems to be for a "V-Grade" device so I adjusted the parameters until I get the Idss for the BL and GR varieties -- copy these down and use for your own device library. It's nice if you have a curve-tracer to check your work, but you can do the same analysis with a pair of power supplies and a DVM and graph in Excel.
Here;s a comparison of the SPICE model for the 2SK711 with some commonly used JFETS:
An externally hosted image should be here but it was not working when we last tested it.
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