Laravel: Usando o Laravel Installer via terminal no Mac

Faça a instalação do Laravel Installer via composer:

composer global require laravel/installer

Use o seguinte comando para adicionar o instalador ao $PATH do seu sistema

Para o zsh:
echo 'export PATH="$HOME/.composer/vendor/bin:$PATH"' >>  ~/.zshrc
source ~/.zshrc

Para Bash:
echo 'export PATH="$HOME/.composer/vendor/bin:$PATH"' >> ~/.bashrc
source ~/.bashrc

Fonte:
https://stackoverflow.com/questions/26376516/laravel-php-command-not-found