Stimulated backward Brillouin scattering with a variety of ion temperatures in hydrogen plasmas is simulated. There are several separated peaks in the time-integrated scattering spectra, which indicate the existence of several acoustic modes, especially for the nearly equal temperature of ions and electrons. The phase velocities of ion acoustic modes can be from one to several ion thermal velocities. Most of the ion acoustic modes are heavily damped with a Maxwellian velocity distribution function, but they can be excited in the stimulated Brillouin scattering process due to ion trapping.