The present invention relates to a modular panel for thermal energy transfer particularly configured for being used in ceilings and walls, comprising a heat-insulating layer (2) forming a supporting structure demarcated by a lower face (2A), an upper face (2B), two side faces (2C, 2D) and two end faces (2E, 2F). Said panel (1) comprises at least one conducting plate (3) attached to the lower face (2A). Said conducting plate (3) is formed by a groove (31) embedded in the heat-insulating layer (2), defining a longitudinal cavity (32) which is configured to house a hydraulic pipe (6), and defining a longitudinal opening (34) which allows inserting the hydraulic pipe (6); a transfer plate (35) extending on the lower face (2A) and closure means (4) configured to seal the longitudinal opening (34) and press the hydraulic pipe (6) against the groove (31).