No, an RJ45 plug cannot directly connect to an SFP (Small Form-Factor Pluggable) port. SFP ports are designed for fiber optic or copper transceivers that use an SFP module. These modules typically have a specific form factor and connector that matches the SFP port on networking equipment.

RJ45 connectors are commonly associated with Ethernet cables and are used for copper-based connections, typically in twisted pair cables. If you need to connect an Ethernet cable with an RJ45 connector to a device with an SFP port, you would typically use a media converter or an appropriate transceiver module.

There are Ethernet SFP modules designed for use with SFP ports that have an RJ45 connector on the other end. These modules are often referred to as "RJ45 SFP" or "copper SFP" modules. They allow you to connect Ethernet cables with RJ45 connectors to SFP ports while still benefiting from the advantages of SFP technology.

Always check the compatibility and specifications of the networking equipment to ensure that you are using the correct transceivers for your specific needs.