We propose a method for printing a radio frequency identification (RFID) tag on paper as a sensor for a wearable bracelet via the Internet of Things (IoT) to allow people to enter a secure area. The RFID paper tag is first printed out when entering the area and then can be torn up by hand when leaving. It can be easily destroyed and cannot be used again, thus preventing privacy violations. This paper tag technology has a low cost, high confidentiality, and low environmental impact. Before using RFID in this manner, it was first necessary to develop an appropriate antenna for use with the RFID tag. In this study, computer simulation software was used to select the best antenna from seven samples that matched the predetermined frequency requirements and obtain S-parameters that matched the desired frequency (924 MHz). This antenna can be used for a removable RFID tag printed directly on a wearable paper bracelet. Reliability experiments were conducted with printed antennas for RFID tags printed directly on paper. This wearable bracelet device can be easily removed to ensure personal security and has industrial applications combining RFID and the IoT.