A sidelink information transmission method, a communications device, and a network device, the method including sending, by a network device, first indication information to a device, the first indication information indicating a first resource that is a resource set used to transmit sidelink information, where the first indication information is used to obtain a correspondence satisfied by a time-domain resource and a frequency-domain resource of a resource that is in the first resource and that is used to transmit the sidelink control information, and sending, to the device, control information indicating a second resource belonging to the first resource, and having a third resource used to send the sidelink control information to a second communications device and satisfying the correspondence, and having a fourth resource used by the device to send the sidelink data to a second device based on the sidelink control information.