In the game, Sans is a laid-back skeleton who loves making jokes and has a somewhat mysterious and complex personality.
Since he is a fictional character, it's impossible for him to be real and interact with people in the real world. Therefore, he wouldn't be able to be your friend outside of the game's universe.
However, if you enjoy the character and the game, you can certainly appreciate the qualities and personality traits of Sans Undertale in the context of the game and the fan community. It's a testament to the creators' storytelling and character design that players can develop strong connections and emotions with fictional characters like Sans.