Background: In reverse shoulder arthroplasty (RSA), preservation of the subscapularis (SSC) has gained attention because of its biomechanical and functional significance. However, when SSC preservation is attempted using the conventional deltopectoral (DP) approach, glenoid visualization and instrument access may be limited. The purpose of this Technical Note is to describe a modified deltopectoral exposure technique, hereafter referred to as the Margin-Shifted, Yawing, Subscapularis-Sparing, and Transitioned Lateralized Deltopectoral (MYST–LDP) approach, and to assess its feasibility in primary RSA. Methods: The MYST–LDP approach incorporates a laterally shifted incision apex, a proximally oriented curved arc (“yawing”) toward the acromion, complete preservation of the subscapularis, and a distally transitioned limb aligned with the anterior humeral axis. We describe the surgical technique and our initial experience in three consecutive primary RSA cases performed using an inlay implant system to minimize humeral lateralization and allow focused assessment of exposure geometry. Results: In all cases, the SSC was preserved without conversion to a standard DP exposure. Adequate glenoid visualization was achieved using three retractors without excessive soft-tissue tension, allowing controlled glenoid preparation and component implantation without additional exposure or conversion. No approach-related intraoperative complications were observed. Conclusions: The MYST–LDP approach is a feasible modification of the deltopectoral exposure that preserves both SSC and the deltoid while facilitating glenoid visualization and instrument alignment. This technique represents an ergonomic and tissue-preserving option within the familiar DP framework for surgeons performing SSC-preserving RSA. Further comparative and quantitative studies are warranted to determine its clinical value.