script to remove them from wifi and add them back

I actually have a script for doing just this. Set this up as a policy to run once on the computer to install it

https://github.com/boberito/jamfscripts/blob/master/RemoveGuest%20-%20LaunchDeamon.sh

You can replace GUEST with your wifi network you want to remove. YOURCOMPANY with whatever you want. And you can change the location to somewhere other than /usr/local/

This will install a launchdaemon that'll watch a the file that gets changed when you add a wifi network. Check if the specific network is added. Then it'll remove it, or if it's currently connected to that network it'll turn wifi off for a moment then remove it and back on.

#!/bin/sh

#Sets up a script and creates a launchdeamon that watches com.apple.airport.preferences.plist
#This changes whenever you join a network. If the Guest network is joined, then remove it and bop them off of it


##################
##CREATE SCRIPT###
##################
cat << EOF > /usr/local/removeGuest.sh
#!/bin/bash

#set interface name and network you're hunting for
interfaceName="Wi-Fi"
networkName="GUEST"

Adapter=$(networksetup -listallhardwareports | grep -A 1 "$interfaceName" | grep Device | awk '{print $2}')

if networksetup -listpreferredwirelessnetworks $Adapter | grep "$networkName"; then
    echo "Guest Found"
    ConnectedtoGuest=$(networksetup -getairportnetwork $Adapter | awk -F ":" '{ print $2 }' | cut -c 2-)
    if [ "$ConnectedtoGuest" == "$networkName" ]; then
            #Gotta disconnect first to remove it
            networksetup -setairportpower $Adapter off
            networksetup -removepreferredwirelessnetwork $Adapter "$networkName"
            networksetup -setairportpower $Adapter on

    else
            networksetup -removepreferredwirelessnetwork $Adapter "$networkName"

    fi
fi

EOF

########################
##CREATE LAUNCHDAEMON###
########################

cat << EOF > /Library/LaunchDaemons/com.YOURCOMPANY.removeguest.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.YOURCOMPANY.removeguest2</string>
    <key>ProgramArguments</key>
    <array>
        <string>sh</string>
        <string>-c</string>
        <string>/usr/local/removeGuest.sh</string>
    </array>
    <key>WatchPaths</key>
    <array>
        <string>/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist</string>
    </array>
</dict>
</plist>

EOF

chown root:wheel /usr/local/removeGuest.sh
chmod 755 /usr/local/removeGuest.sh

chown root:wheel /Library/LaunchDaemons/com.YOURCOMPANY.removeguest.plist
chmod 644 /Library/LaunchDaemons/com.YOURCOMPANY.removeguest.plist

launchctl load -w /Library/LaunchDaemons/com.YOURCOMPANY.removeguest.plist