Thanks for your replies. I just noticed thatI messed it up. The amplifier I used in my question is not the one from the link. The one from the link is the correct one though.
So, if you Connect the SCK pin to Digital #13 , Connect the SDO pin to Digital #12 ,Connect the SDI pin to Digital #11.
then you can have pin 10 for your SD card and 14 thermocouples.
But now I am confused. If I do it like this, I just can use one amplifier. Or is there a way to connect all of the amplifiers to these same pins? If yes, how? I'm sorry if the questions are stupid, but I feel I'm in the darkness.
You should be aware that the Arduino 3.3v pin cannot provide much current and if you have several 3.3v devices you may need a separate 3.3v supply. That could be provided using an LD1117 voltage regulator connected to the Arduino 5v pin.
But I need pin 5 for the SD card. Or, again, is it possible for the pins to share the lines? If not, is there another 5v pin?
I'm really thankful for your replys.