The emission and excitation spectra of Nd3+ ions in KGd(WO4)2 crystals have been studied showing a clear structure in the single transitions associated with Stark sublevels of Nd3+ ions at low temperature. In this work, site selective spectroscopy under the presence of high magnetic field (up to 10 T) has been used. A variety of Nd3+ centers is responsible for the shape of the spectra at 0 T, which can not be selectively excited. By increasing magnetic field Zeeman splitting of the Stark levels is observed and the Nd3+ centers can be selectively excited. The Zeeman splitting is in agreement with an effective giromagnetic factor of 2.01 for the lowest Kramer doublet of the 4I11/2 state of Nd3+ ions.