Second modem connecttion

> I have a wireless cable modem [...]

   Has it a maker and model number?

> [...] connected at one end of my house. [...]

   "connected" to what?

> [...] I want to connect my CM700 [...]

   A CM700 is a cable-TV-type modem, not a wireless anything.

   _Why_ do you want to do anything?  Have you some actual goal in mind,
beyond running cables around your house?

> [...] through a cable splitter [...]

   If you mean a co-axial cable, then your (unspecified) ISP would
probably be unhappy if you tried to connect multiple modems to their
line.

> [...] Can I do this?

   I don't know what "this" is.

   If you actually have a (wireless) router connected to your CM700,
then you should be able to run an Ethernet cable from it to the other
end of your house, where you could then connect something else, like,
say, a computer, or a wireless access point.

   Without an accurate description of what you actually have, or what
you actually want to achieve, it's tough to offer specific advice of any
value.