We propose a source entropy controlled enumerative sphere shaping (EC-ESS) scheme to address inflexible source entropy control in sphere shaping. The proposed scheme employs a model-driven interval search algorithm to establish the relationship between the source entropy of one-dimensional and two-dimensional symbols. Data analysis indicates that within various ranges of source entropy, the number of achievable source entropies for EC-ESS surpasses that of optimum ESS (OESS). The experimental results indicate that EC-ESS provides considerable OSNR gains compared to the reference schemes, with gains of 0.04 dB, 0.27 dB, and 0.52 dB compared to OESS, BL-DM, and CCDM, respectively.