Add noise to signal (student-t or Laplace distribution)

Hi! I want to add noise into a signal by specifing the SNR level.

I know the awgn (out = awgn(in,snr)) function of matlab, which adds white gaussian noise.

However, i want to add noise, which follows a student-t or Laplace distribution (only specifying the SNR level).

Is there a matlab function for that? or could you help me on how to do it?

Thanks in advance