  We present a complete description of a new physical model with goldstino
supermultiplet for CompHEP software package. The model contains MSSM content
supplemented by three new fields: {\it goldstino} -- two component spinor,
scalar {\it sgoldstino} and pseudoscalar {\it sgoldstino}. To the leading order
in 1/F, where F is the parameter of supersymmetry breaking, and to zero order
in MSSM gauge and Yukawa coupling constants, the interactions between the
component fields of goldstino supermultiplet and MSSM fields are derived. They
correspond to the most attractive for collider studies processes where only one
of these {\it new} particles appears in a final state. In this case light
gravitino behaves exactly as goldstino. For sgoldstinos, as they are R-even, we
include in the package only sgoldstino couplings to goldstino and sgoldstino
couplings to SM fields as the most interesting phenomenologically. All new
coupling constants between the components of goldstino supermultiplet and MSSM
fields are completely determined by the ratios of soft supersymmetry breaking
parameters and F. Thus, in addition to the MSSM coupling constants there are
three new parameters in the package: the scale of supersymmetry breaking,
$\sqrt{F}$, and masses of scalar and pseudoscalar sgoldstinos. The CompHEP
notations for the new fields and parameters are presented. The package was
successfully tested and all relevant results known in literature have been
reproduced with good accuracy. It may be used in order to calculate any
tree-level process with one gravitino or sgoldstino on mass shell. Universality
of the Lagrangian allows to apply the package in study of phenomenology of any
supersymmetric extension of the Standard Model.
