Yes there is a way to do this. We used have a 4,000 gallon pond, kidney shaped with plant ledges on the sides. I think through the centreline the pond was 24 feet long and 38" deep at middle of the bottom slope.
The liner was EPDM and what I did was purchase an over sized sheet for the liner and cut the liner to fit using duct tape to hold it together with a four inch overlap. I then rolled the whole lot up and took it to a local rubber contractor and had all the joints vulcanized. I also used a 2 inch thick Styrofoam between the liner and the clay sides and bottom.
The liner was in service for sixteen years with no issues at all. When I closed the pond I had several people willing to buy it from me. The pond was located in central Alberta and every winter when I shut it down I framed over it with 2x4's and a large tarpaulin. The snow covering acted as an insulator and throughout the winters when ever I took a peak there was never ice on it. The nine koi in the pond did very well and grew to over 26 inch with several attempts at mating.
BTW the reason we decided to close the pond was to allow us more flexibility for traveling.
We certainly miss the pond and I'm sure you will get great enjoyment and satisfaction from yours.
All the best.