Yes you can.
$ wget -q -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
$ echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php7.list
$ apt-get update
$ apt-get install php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl php7.1-bcmath
$ update-alternatives --set php /usr/bin/php7.0