This paper investigates the quasinormal modes (QNMs) of a regular black hole (BH) with a Minkowski core and sub-Planckian curvature. The BH under study exhibits similar large-scale behavior to the Hayward BH and loop quantum gravity (LQG)-corrected BH. A notable feature of the QNMs is the pronounced outburst of overtones compared to the Schwarzschild BH (SS-BH), which is attributed to quantum gravity effects in the near-horizon region. The QNMs of this regular BH show a similar overtone outburst in their high overtones. The study compares the QNM properties of the regular BH with those of the Hayward BH and LQG-corrected BH, highlighting the potential of QNMs as a tool for detecting quantum gravity effects and distinguishing different BH models. The regular BH with a Minkowski core is characterized by a modified Newton potential that suppresses the scalar curvature, making it suitable for BHs with small masses or during the final evaporation phase. The BH's metric is derived from the Klein-Gordon equation, and the effective potential is analyzed for scalar field perturbations. The QNMs are calculated using the WKB and pseudo-spectral (PS) methods, showing that the ninth-order WKB approximation provides high accuracy. The QNMs exhibit non-monotonic behavior for the fundamental mode when the deviation parameter α₀ increases, but this behavior disappears for l ≥ 1. The overtones show a significant outburst, indicating a deviation from the SS-BH, which may be linked to quantum gravity effects. The study compares the QNMs of the regular BH with those of the Hayward BH and LQG-corrected BH, finding that the regular BH's QNMs differ by up to 4.3% for certain high overtones. This difference suggests that QNMs can be used to distinguish between different BH models. The results indicate that QNMs are a powerful tool for detecting quantum gravity effects and understanding the properties of BHs. The findings contribute to the broader understanding of BH physics and the potential of gravitational wave observations in probing quantum gravity.This paper investigates the quasinormal modes (QNMs) of a regular black hole (BH) with a Minkowski core and sub-Planckian curvature. The BH under study exhibits similar large-scale behavior to the Hayward BH and loop quantum gravity (LQG)-corrected BH. A notable feature of the QNMs is the pronounced outburst of overtones compared to the Schwarzschild BH (SS-BH), which is attributed to quantum gravity effects in the near-horizon region. The QNMs of this regular BH show a similar overtone outburst in their high overtones. The study compares the QNM properties of the regular BH with those of the Hayward BH and LQG-corrected BH, highlighting the potential of QNMs as a tool for detecting quantum gravity effects and distinguishing different BH models. The regular BH with a Minkowski core is characterized by a modified Newton potential that suppresses the scalar curvature, making it suitable for BHs with small masses or during the final evaporation phase. The BH's metric is derived from the Klein-Gordon equation, and the effective potential is analyzed for scalar field perturbations. The QNMs are calculated using the WKB and pseudo-spectral (PS) methods, showing that the ninth-order WKB approximation provides high accuracy. The QNMs exhibit non-monotonic behavior for the fundamental mode when the deviation parameter α₀ increases, but this behavior disappears for l ≥ 1. The overtones show a significant outburst, indicating a deviation from the SS-BH, which may be linked to quantum gravity effects. The study compares the QNMs of the regular BH with those of the Hayward BH and LQG-corrected BH, finding that the regular BH's QNMs differ by up to 4.3% for certain high overtones. This difference suggests that QNMs can be used to distinguish between different BH models. The results indicate that QNMs are a powerful tool for detecting quantum gravity effects and understanding the properties of BHs. The findings contribute to the broader understanding of BH physics and the potential of gravitational wave observations in probing quantum gravity.