The IEEE 802.11ay is an emerging system that will become a full member of the big family of the IEEE 802.11 standards in the near future. Compared to its predecessor IEEE 802.11ad, it promises to offer higher system flexibility and more reliable wireless communication links for short distances in millimeter-wave bands. This paper provides a simulation-based performance study of IEEE 802.11ay single carrier-physical (SC-PHY) layer for different transmission modes and scenarios. For this purpose, a MATLAB-based IEEE 802.11ay SC-PHY simulator is introduced. Next, 60 GHz indoor channel models based on extensive real-world indoor measurements, conducted by ourselves, are created and used to analyze the performance of IEEE 802.1ay SC-PHY in terms of Bit Error Ratio and data throughput. Both the simulator and channel models are available online. A phase noise behavioral model to emulate channel impairments is also considered and used in this work. The obtained results show how the IEEE 802.11ay SC-PHY system employing different transmission modes is influenced under various channel conditions.